Battery-plate



A. J. TRIGWELL.

BATTERY PLATE.

APPLICATION FILED APR. 16, 1920.

Patented Feb. 1,1921.

Ljlz 1! 1 L 1] FIGURE 1 H II IL ll H II 1| FIGURE 5 ATTORNEY i the same.

UNITED STATES PATENT OFFICE.

ALFRED J. TRIGWIE ILL, OF SAN JOSE, CALIFORNIA.

BATTERY-PLATE.

fatness Application filed April. 16,

To all whom it may concern:

Be it known that I, ALFRE J. TRIGWELL, a subject of the Kin of GreatBritain, and a resident of San dose, in the county of danta Clara andState of California, have invented certain new and useful Improve mentsin Battery-Plates, of which the following is a' specification.

The grid of a battery plate is subjectto varying degrees of temperaturewhen in use which causes alternate expansion and contraction of itsseveral parts. This expansion and contraction causes the loosening ofthe filling material, parts of which fall'down between adjacent plates,thereby necessitating the use of separators to prevent short circuitingof the said plates and reducing their efficiency and shortening the lifeof the strain to which the sides of the grid, or the frame, aresubjected frequently results in their complete rupture. v A

It is the object of the present invention to provide a grid so formedand constructed as to permit the proper expansion and contraction of thegrid frame and the cell walls therein without rupturing any part of thegrid. A further object isto provide a structure that can expand andcontract withoutl dislocating the filling material.

In the drawing:

Figure 1 is a side elevation of a battery plate embodying my invention.

Fig. 2 is an enlarged section on 2-2 of Fig. 1 as formed ready to befilled.

Fig. 3 is an enlarged section on 22 of Fig. 1 after filling and afterthe forming 'is completed.

Referring more particularly to the drawing, 1 indicates the frameportion of a battery plate grid, the same usually being made of lead andof suitable proportions. At one or more points, preferably at thecorners of the frame, the same is formed into loops as at 2, the saidloops curving outwardly in the embodiment shown. The frame 1 and theintersecting cell walls 3 are formed inte- Specification of LettersPatent.

Furthermore, as now constructed' Patented Feb. 1, 1921. i920. Serial No.374,465.

grally with retaining flanges if: encompassing the opening of each cellon one side of the filling materlal has been placed in position thesecell walls are bent inwardly as shown at 6 to form flanges correspondingto flanges 4 so that the material in each cell is securely held inposition and cannot be dislodged except by its entire disintegration.

It may now be seen that any unusual strain on frame 1 due to thealternate heat ing and cooling of the plate is readily taken up by theloops 2, and any distortion of the cells in the plate through thealternate expansion and contraction of the cell walls, does notmaterially affect the filling in the cells or the operation thereo sincethe flangesd and 6 effectually hold be material in position. While loop2 may be located in any desired position the corner is deemed best sincein that position it readily allows for the expansion and contraction oftwo sides. It is to be understood that in using the tern1i loop in thefollowing claims any formation is included in which an excessive lengthis provided in the frame without increasing its principal proportions.

It is furtherunderstood that changes in form and construction may bemade within the scope of the appended claims.

I claim 1. A battery plate havingan expansion loop formed in the framethereof.

2-. ,A battery grid having an expansion loop formed in two of theopposite corners thereof. 7

3. A battery plate comprising a grid having an expansion loop formed inthe frame thereof and having means formed integrally therewith toprevent the dislocation of filiing material from the cells thereof.

- ALFRED J. TRlGlVELL.

